Nanomaterials (Aug 2023)

Construction of an Amethyst-like MoS<sub>2</sub>@Ni<sub>9</sub>S<sub>8</sub>/Co<sub>3</sub>S<sub>4</sub> Rod Electrocatalyst for Overall Water Splitting

  • Zhen Pei,
  • Tengteng Qin,
  • Rui Tian,
  • Yangxin Ou,
  • Xingzhong Guo

DOI
https://doi.org/10.3390/nano13162302
Journal volume & issue
Vol. 13, no. 16
p. 2302

Abstract

Read online

Transition metal sulphide electrocatalytic materials possess the bright overall water-splitting performance of practical electrocatalytic technologies. In this study, an amethyst-like MoS2@Ni9S8/Co3S4 rod electrocatalyst was constructed via a one-step hydrothermal method with in-situ-grown ZIF-67 nanoparticles on nickel foam (NF) as a precursor. The rational design and synthesis of MoS2@Ni9S8/Co3S4 endow the catalyst with neat nanorods morphology and high conductivity. The MoS2@Ni9S8/Co3S4/NF with the amethyst-like rod structure exposes abundant active sites and displays fast electron-transfer capability. The resultant MoS2@Ni9S8/Co3S4/NF exhibits outstanding hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalytic activities, with low overpotentials of 81.24 mV (HER) at 10 mA cm−2 and 159.67 mV (OER) at 50 mA cm−2 in 1.0 M KOH solution. The full-cell voltage of overall water splitting only achieves 1.45 V at 10 mA cm−2. The successful preparation of the amethyst-like MoS2@Ni9S8/Co3S4 rod electrocatalyst provides a reliable reference for obtaining efficient electrocatalysts for overall water splitting.

Keywords